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Flow behavior of power‐law fluids in the entrance region of annuli
Author(s) -
Tiu Carlos,
Bhattacharyya Satinath
Publication year - 1973
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450510108
Subject(s) - laminar flow , power law fluid , momentum (technical analysis) , mechanics , power law , newtonian fluid , non newtonian fluid , flow (mathematics) , energy–momentum relation , limiting , physics , classical mechanics , mathematics , engineering , mechanical engineering , statistics , finance , economics
Momentum‐integral and momentum‐energy‐integral methods are used to study the laminar entrance behaviour of power‐law fluids in annuli. The momentum‐energy method, which yields a longer entry length, appears to provide a better overall description of the entry flow behaviour. The method compares favourably with the existing Newtonian solutions for annular flow and with the non‐Newtonian flow in pipes and parallel plates in the limiting cases. The linearisation technique is also extended to power law fluids utilising the geometric parameter method. The loss coefficients predicted by the linearisation technique agree well with those obtained by the integral methods.